SSD's are better for reading data such as booting and not so much for writing it like recording. Although your old HDD was slower I would still recommend using an HDD for high quality recording.
I disagree. SSD have faster read and write than a mechanical hard drive. They do require a bit more CPU overhead than a mechanical drive though which could be a problem. Is your computer running in High Performance mode in the control panel? Did you disable write caching on the disk?